Synchronous multiplex telegraphy



2 Sheets-Sheet I.

(No Model.)

P. J. PATTEN SYNOHRONOUS MULTIPLEX TELBGRAPHY.

No. 428,225. Patented May 20, 1890.

rawwwg 250 4 x Mm, summon, n. c.

(No Model.) 2 Sheets-Sheet 2.

I F. J. PATTEN. SYNGHRONOUS MULTIPLEX TELEGRAPHY- No. 428,225. Patented May 20, 1890.

mum-m UNITED STATES PATENT OEFIcE.

FRANCIS JARVIS PATTEN, OF NEW YORK, N. Y, ASSIGNOR TO J. M. SEYMOUR, OF BRICK CHURCH, NEIV JERSEY.

SYNCHRONOUS MULTIPLEX TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No. 428,225, dated May 20, 1890.

Application filed January 10, 1890. Serial No. 336,581. (No model.)

T on whom it may concern.-

Be it known that I, FRANCIS JA nvIs PA'ITEN, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and usefulImprovements in Sending and Receiving Instruments for Multiplex Telegraphs, of which the following is a specification.

My invention consists in the organization IO of receiving apparatus designed to produce ordinary Morse signals in a system of syn chronous multiplex telegraphy. In such systems the relays are actuated by a series of intermittent impulses; and the object in devising special forms of receivingdnstruments is to produce an organization of devices which will respond clearly to such intermittent currents. Ordinary receiving-instruments will chatter or vibrate and the sounder will not produce the signal sent by the key.

In the drawings, Figures 1 and 2 are a plan and end elevation of the receiving-relay. Fig. 3 shows one set of instruments arranged for sending and receiving by ordinary Morse 2 5 writing in the multiplex system between two stations X and Y, connected by a main-line circuit, one set of instruments being shown in operation at each station, those at Y sending and those at X receiving.

0 1 Referring to Figs. 1 and 2, on a base B is mounted an ordinary relay-magnet M, which instead of the ordinary form of armature has placed in front of its poles a thin iron ribbon, so arranged that it can be stretched rigidly.

5 It is fixed in one end in a post p, and, passing through the slot in the post 19 is fastened to a set-screw S by means of which the ribbon can be given the proper degree of ten sion. The magnet M is adjusted in the or- 0 dinary way by means of the set-screw S so that the magnet-poles may be approached to or moved away from the ribbon. IVhen intermittent impulses of current are sent into the coils of the magnet M and connected in the main-line circuit, the ribbon a is maintained in constant vibration; but when at rest the contact-point it rests against the adjustable point S. Two such instruments are used in conjunction with each other, as shown in Fi 3, to cause an ordinary Morse sounder to respond to the signals of the key. The

manner in which this is accomplished will be understood from an examination of Fi 8,

in which a single set of sending and receiving instruments is shown at the stations X and Y, Y being represented as sending to X.

A description of the operation of these instru ments at one station will answer for both.

Re is the receiving-relay, just located in the main-line circuit. Close to it, and preferably mounted on the same base, is an auxiliary relay Ar of similar construction, and a narrower and heavier instrument to operate on a local circuit and battery. hen the key K at Y is depressed, as shown, the receiving relay Rn receives a series of intermittent impulses of current. The ribbon a is maintained in constant vibration, so that the local circuit of the auxiliary relay is opened. This allows the ribbon of the auxiliary relay to fly back against the contact-stop and close the circuit of the sounder D If, however, the key K is open, the impulses in the receiving-relay Rv cease, the ribbon at strikes its back contact, and the circuit of the auxiliary relay Aris closed, the ribbon a" is drawn away from its contact, and the sounder-circuit is open. In this way the sounder is caused to follow the motions of the key, and as the same operations are repeated at the distant stat-ion signals can be transmitted with a key and sounder, in ordinary Morse writing, with intermittent-eurrent impulses.

While there may be nothing essentially novel in the instruments shown in Figs. 1 and 2, I desire to claim in this application especially the combination of such instruments in the manner shown in Fig. 3, by which a sounder can be made to follow the key and produce ordinary Morse writing ina system of synchronous multiplex telegraphy.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is

1. A main line including an electrical gen- 5 orator, which continuously sets up currents of alternate polarity over the line, and a relay having a reed or ribbon armature kept continuously vibrating, in combination with an auxiliary relay included in a local circuit ICO with the reed orribbon armature and a local sounder included in a second local circuit with the armature of the auxiliary relay, substantially as described.

2. In a synchronous multiplex telegraph, a pair of distributors connected by a main line including an electrical generator adapted to set up constantly over the line alternating currents, a series of transmitters connected to the distributer-circuits, and a series of receiving-relays, one for each transmitter, said relays having reed arinatures and local-circuit connections, substantially as described.

3. In a synchronous multiplex telegraph, a pair of distributers connected by a single main line, which includes in its circuit a mainline electrical generator adapted to set up continuously rapidly-recurring alternating electrical currents, multiplex transmitters, and receivers connected to the distributors, 

